[TenTec] New Jupiter on its Way _ A Few Questions

[Richard Tschur]

Hi all,
a really good quality magnetic loop is available from Kaeferlein in 
Germany! I have one with 80cm in diameter and it can handle up to 
500Watts and it performs really well. They are not cheap, but they do 
perform. I bought mine used years ago for like 300 german Marks (good 
old times;-)), and i had great contacts on it. For example, the antenna 
was mounted about 50 cm above ground between the houses and i had a 
contact from Melbourne VK to Italy with 100 watts. But the important 
thing is, from what I've been told, no joins, one loop out of aluminium 
with at least 33mm diameter. This Kaeferlein guy is sort of a pioneer 
with loops, he made them for decades. Just my take on them, so if you 
have no space, go for a good quality loop, you can put them nearly 
everywhere, in the garage, in the basement, height is not really 
critical, from what I have experienced. Just my take on it. Here is the 
link to Kaeferleins web side
www.ama-antennen.de
Unfortunately only in german, but I think pretty much self explaining.
I forgot to mention: the loop I have covers 13.5 to 30 MHz. I have 
another one from DJ0HV, he makes sort of homebrew semi comercial, this 
one is 2 m in diameter and covers 80 to 20 m and can handle up to 1 kw. 
The aluminium pipe is 60mm in diameter. Both of them are fully remote 
controllable! The only disadvantage in my opinion is, you have to retune 
every like 15 to 30 KHz, if you transmit, but you get a very selective 
and quiet antenna and in comparison with a dipol, it is maybe half to an 
s point lower! An that, you can compensate with a bit of juice behind 
the antenna ;-)!

Regards and greetings from Down here
Richard VK3KVK / DK3KVK



On 27/04/14 06:49, Rockinghorse Winner (Terry) wrote:
> K8JHR wrote:
>> I have used the Wellbrook ALA-100M receiving loop for over a decade
>> with good results at two locations.  It is a "medium or large 
>> aperture" loop, because you supply whatever size wire loop you want.  
>> I used mine outside, but you could do it inside, but of course it 
>> tends to be more RF quiet the farther you get away from your 
>> dwelling.  Wellbrook also makes a model that uses a 1 meter alum 
>> loop, which works well indoors. The loop does not have to be round or 
>> symmetrical, and you can use very light litz wire which is nearly 
>> invisible outside.  They can also be used indoors, as in an attic, 
>> but you don't want to be listening on it when you are transmitting on 
>> it, if you cannot locate it at least 1/4 to 1/2 wavelength away from 
>> the transmitter antenna (which applies to all receive only antennas I 
>> suppose.)  These work on the magnetic portion of the electromagnetic 
>> waves we work with, as does Rick's project.
>>
>> See The Wellbrook products here:
>>
>> http://www.wellbrook.uk.com/antennashop/
>>
>>
>> I have also used a DX-Engineering active whip with good results. I 
>> have mine in the front yard, away from the transmitting antennas in 
>> the back yard, and it has a very low profile.  These work on the 
>> electrical portion of the electromagnetic waves we work with. They 
>> have a single vertical whip model, and a dipole model, and you can 
>> see them here:
>>
>> single vertical model:
>>
>> http://www.dxengineering.com/parts/dxe-arav3-1p
>>
>> dipole model:
>>
>> http://www.dxengineering.com/parts/dxe-arah3-1p
>>
>>
>> I have used both the Wellbrook loop and the DX-E active whip with 
>> good results as receive only HF antenna on my small suburban lot, 
>> although they are substantially more expensive than Rick's home brew 
>> project.  I know several SWL's who have built similar loops to Rick's 
>> project, with good results. It is a classic.
>>
>> I went to the Wellbrook site. But the antenna you cited was 60" in 
>> diameter, too large for my room. Did you say they had some smaller 
>> loops? In any case, I'm going to try to build a receive mag loop 
>> according to the instructions Rick provided. It seems like a straight 
>> forward project that should take a few hours at most.
>
>> Happy trails.
>> ----------------------  K8JHR  -----------------------
>>
>>
>>
>> On 4/25/2014 6:05 PM, Jim Allen wrote:
>>> You might also consider the helically loaded loops that K8NDS has been
>>> developing.
>>
>>
>> _____________________________________________________
>> _______________________________________________
>> TenTec mailing list
>> TenTec at contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
>
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>